Hajimete no iede (2009)

A junior high school student's parents are divorced. She has to relocate and change schools as well. Her parents have moved to separate abodes, which means the girl is always in-between the two places. She begins her new school life. She makes a friend whose older sister is a runaway given how her parents did not accept her getting married. The new friend wants to join her older sister and also run away come spring. The new girl decides to join in.